bw_mem_rd - time memory read rate (with overhead)
allocates the specified amount of memory, zeros it, and then
times the reading of that memory as a series of integer loads and adds. Each
four byte integer is loaded and added to accumulator.
The size specification may end with ``k'' or ``m'' to mean kilobytes (* 1024) or
megabytes (* 1024 * 1024).
Output format is "%0.2f %.2f\n", megabytes,
This benchmark should move approximately the reported amount of memory.
Funding for the development of this tool was provided by Sun Microsystems